PC3 PC2 PC1 PC0 TEST 1 0 0 1 Bad port 0 1 1 0 Bad port 1 0 1 0 Bad RAM 1 0 1 1 Bad ROM 1 1 0 0 Bad Timer 1 1 0 1 Bad SCI 1 1 1 0 Bad A/D 0 0 0 0 Bad EEPROM 0 0 0 1 Bad PLM 0 0 1 0 Bad interrupts 0 0 1 1 Bad watchdog Flashing Good device All others Bad device, bad port etc. 0 - LED on; 1 - LED off;
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